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We present results of optical spectroscopic observations of candidates ofLyman Break Galaxies (LBGs) at $z \sim 5$ in the region including the GOODS-Nand the J0053+1234 region by using GMOS-N and GMOS-S, respectively. Among 25candidates, five objects are identified to be at $z \sim 5$ (two of them werealready identified by an earlier study) and one object very close to thecolor-selection window turned out to be a foreground galaxy. With thisspectroscopically identified sample and those from previous studies, we derivedthe lower limits on the number density of bright ($M_{UV}<-22.0$ mag) LBGs at$z \sim 5$. These lower limits are comparable to or slightly smaller than thenumber densities of UV luminosity functions (UVLFs) that show the smallernumber density among $z \sim 5$ UVLFs in literature. However, by consideringthat there remain many LBG candidates without spectroscopic observations, thenumber density of bright LBGs is expected to increase by a factor of two ormore. The evidence for the deficiency of UV luminous LBGs with large Ly$\alpha$equivalent widths was reinforced. We discuss possible causes for the deficiencyand prefer the interpretation of dust absorption.

Lyman Break Galaxies at z~5: Rest-Frame UV Spectra. III